Highly Efficient, Rapid, and Simultaneous Removal of Cationic Dyes from Aqueous Solution Using Monodispersed Mesoporous Silica Nanoparticles as the Adsorbent

Abstract

In this work, a highly efficient and rapid method for simultaneously removing cationic dyes from aqueous solutions was developed by using monodispersed mesoporous silica nanoparticles (MSNs) as the adsorbents. The MSNs were prepared by a facile one-pot method and characterized by scanning electron microscopy, transmission electron microscopy, Fourier-transform infrared spectroscopy, and Brunauer-Emmett-Teller. Experimental results demonstrated that the as-prepared MSNs possessed a large specific surface area (about 585 m2/g), uniform particle size (about 30 nm), large pore volume (1.175 cm3/g), and narrow pore size distribution (1.68 nm). The materials showed highly efficient and rapid adsorption properties for cationic dyes including rhodamine B, methylene blue, methyl violet, malachite green, and basic fuchsin. Under the optimized conditions, the maximum adsorption capacities for the above mentioned cationic dyes were in the range of 14.70 mg/g to 34.23 mg/g, which could be achieved within 2 to 6 min. The probable adsorption mechanism of MSNs for adsorption of cationic dyes is proposed. It could be considered that the adsorption is mainly controlled by electrostatic interactions and hydrogen bonding between the cationic dyes and MSNs. As a low-cost, biocompatible, and environmentally friendly material, MSNs have a potential application in wastewater treatment for removing some environmental cationic contaminants.

Synthesis of high surface area mesoporous silica SBA-15 by adjusting hydrothermal treatment time and the amount of polyvinyl alcohol

“…SEM analysis was incredible analysis for showing the surface morphologies of SBA-15 samples. Figures 5 shows that the mesoporous silica SBA-15 consists of the narrow pore with well ordered hexagonal arrays of mesoporous materials [25,27,28] The comparison between Figure 7(a) and 7(b) reveals that the increased the time of the hydrothermal treatment can reduce the aggregate into well ordered porous materials. The SEM image of SBA_5 gives an expression that the sample relative uniform.…”

Adsorption and photo-Fenton catalytic degradation of organic dyes over crystalline LaFeO3-doped porous silica

“…disposal or regeneration. For example, in the case of this study, the use of high temperature (normally >500 C) or organic solvent would be needed to regenerate dye-saturated adsorbents for recycle and reuse, 41,42 which may add further cost and complexity to the process. Advanced oxidation process (AOPs) have shown advantageous features as compared with adsorption.…”

Synthesis of Nano-Zinc Oxide Loaded on Mesoporous Silica by Coordination Effect and Its Photocatalytic Degradation Property of Methyl Orange

“…In the past decade, mesoporous silica had been considerably made as a structural basis for nanotechnological applications as it is porous, thermally stable, non-toxic and hydrothermally stable [ 15 , 16 , 17 , 18 , 19 ]. Furthermore, as it has uniform and tunable channels with a pore diameter ranging from 2~50 nm, it can also be used to control the size of nanoparticles and make them homodisperse during their formation [ 6 ].…”